Grinding and polishing machine.



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No. 665,207. `Patented lan. I, |90I.

' w. L. GUDFBEY.

GHINDING AND PGLISHING MACHINE.

(Application led July 1B, 1900.\

(No Model.; l 3 sheetvsheet l'.

" UNIE;

/NVE/v TOR MM' 5. MM

No. 665,207. 4Patenffmi 1an. 190|.

w. L. Gournay.

GRINDING AND POLISHING MAISHINE.l

(Application Sled July 18, 1900.) m0 Model.. s sheets-sheet 2.

/NVENTQR W/r/VESSES: MMM I. {Svdw Afin/mynno. 665,207. ,Patentad 1an. mol.

W. l.. GUDFREY. GBINDING AND PULISHING MACHINE.

(Application led July 1B. 1900.- (No Model.: 3 Sheets-$heet 3u.

IN1/EN TOR l/l///VESSES? UNITED STATES *PATENT Ormes.

WILLIAM L. GODFREY,`OF NEW YORK, N. Y., ASSIGNOR OF TWO-THIRDS TO THOMAS ROBERTSON AND THE NEW YORK STEEL AND COPPER PLATE COMPANY, OF SAME PLACE. p

GRINDING AND POLISHING MACHINE;

SPECIFICATION forming part of Letters Patent N o. 665,207, dated January 1, 190i. Application filed VJ'uly I8, 1900. Serial No. 24,071. (No model.)

To all whom t may concerraf Be it known that I, WILLIAM L. GODFREY, a citizen of the. United States, residing in the city of New York, borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Grinding and Polishing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention is an improvement in grinding and polishing machines, and is adapted particularly for grinding and polishing the plane surfaces of metallic articles-for example, metal plates. A

My invention consists in the novel features hereinafter described, reference being had to the accompanying drawings, which illustrate one form in which I have contemplated polishing-belt D, I provide a pair of drums or f rollers G G', the shafts or trunnions of which embodying my invention, and saidinvention is fully disclosed in the following description and claims. l Y

Referring to the drawings, Figure l represents a side elevation ofa machine for polishing metal plates embodying my invention. Fig. 2 represents a top. plan view ofthe same. Fig. 3 represents a vertical section of Fig. l, taken on the line3 3 and looking in thedirection of the arrows. Fig. 4 is a detail sectional view of my improved polishing-belt. Fig. 5 is a plan view of my pressure-belt, showing the sides adjacent to the polishingbelt. Fig. 6 is a longitudinal section of the pbrezsgsure-belt, showing the transverse plates In the drawings, A represents the framework of the machine, which is supported upon suitable legs a and so constructed as to support the various parts of the apparatus.

B represents the driving-shaft of the machine, mounted in bearings b and provided with a suitable driving-pulley B', by means of which the shaft may be driven from any suitable source of power. Upon the shaft B is mounted a drum or roller C, which is provided at its ends with projecting flanges c, the portion of the drum between the flanges grinding and polishing belt D.

C represents a drum or roller similar to the drum C, provided with ianges c and mounted being engaged by and adapted to drive the upon a shaft c', which is journaled in a yoke E, adapted to slide horizontally in the main frame A.

F represents a tension device consisting in this instance of a screw passing through a threaded aperture in the main frame A and The grinding and polishing belt D passers.'

around thedrum C', between the flangesl thereof, and by means of the yoke E and screw F the belt can be maintained at the proper degree of tension, as will be readily seen lfrom the drawings.

Between the upper and lower laps of the vformed in the main frame A to receive the said blocks,'and tension-screws g2 are providedto engage said blocks,and thereby movey the drums G 'G' away from each other for the purpose of securing the proper tension of a second belt H, which I term the pressurebelt and which passes around the drums G G'. Of course it is obvious that the bearing of one of the drums G Gl might be made rigid and the other adjustable, if desired.

The grinding and polishing belt D, a section of which is illustrated-in Fig. 4, is a composite belt. The belt properis composed of a series of separate belts of suitable material, preferably leather, the said separate belts being arranged side by side and of such width and such number as toform a belt of the desired width. In the present machine I have illustrated the belt made of six sections or smaller belts d d, each of which will be preferably four inches wide, making a total width of twenty-four inches. Upon the exterior of these separate belts is cemented or otherwise y secured a polishing or grinding surface d',

which is of the full Width of the entire series of separate belts and is of a material suitable to receive and carry a polishing or abrading material, the said polishing-surface serving also the purpose of permanently uniting all of the separate inner belts CZ CZ. I prefer to employ for this polishing-surface felt, Walrus-leather, or other suitable material, the outer surface of which Will be supplied With ernery, pumice, rouge, or other suitable grinding or polishing materials, as hereinafter described. The pressure-belt I-I is also a composite belt, as illustrated in Fig. 5, which figure shows Ithe side of the belt which comes next to the inner side of the grinding and polishing belt. The belt H is composed of a series of separate belts arranged side by side in a manner similar to the separate belts of the grinding and polishing belt. On the inner face of the pressurebelt I provide at intervals a series of transverse metal bars extending the full Width of the aggregate separate belts h,said transverse bars being indicated by the reference-letter h. On the outer face the pressure-belt is provided with a series of transverse metal bars h2, in line with the bars Zt; but the transverse bars h2 are preferably made of different lengths and are disposed at different locations transversely of the belt. For example, in Fig. 5 I have illustrated three different arrangements of these bars h2. In one case the bar extends the full Width of the belt. In another case tw'o bars, each less than half the width of the belt, extend from the outer edges of the belt toward but not to the center. In the third case a single bar of less length than the width of the belt is located centrally of the belt. I do not desire to be limited to these exact arrangements, as the plates or bars h2 may be arranged in any desired manner, the object being to provide the belt with pressure-blocks located so as to eX- ert pressure upon the grinding and polishing belt at different points across the width thereof. The plates or bars h2 are secu red to the belt preferably by bolts or rivets, which extend through the belt-sections h and through the transverse bars 7i. on the inner face of the pressure-belt. As the bars h' preferably extend entirely across the pressure-belt, it will be seen that the separate sections of the belt will be firmly united by the construction just described. The object of making both the pressure-belt and the grinding and polishing belt in a series of sections and then uniting them is to prevent, so far as possible, the evil inliuences of unequal stretching of the leather, so that these inequalities Will be equalized and the composite belts will run true at all times.

I provide means for running the two belts D and H so that the contiguous lower laps thereof will run at exactly the same speed and in the same direction. This may be accomplished in any desired way for instance, by means of a train of gearing indicated in Fig. 2, in which c2 represents a gearWheel on the shaft B, meshing with an idle gear c3, mounted on a stud c4 and meshing in turn with a gear-Wheel g3 on the shaft or trunnion g4 of the roller G. If it is desirable to have the idle gear c3 movable, the stud-axle c4 thereof canbe suspended, by means of links, from the shaft B and shaft g4 in a well-known Way to permit the movement of the shaft gA1 Without interfering with the mesh of the three gear-Wheels. This construction is illustrated in Fig. 2, in which c5 c5 and c6 cG represent the links supporting the stud of the idlegear wheel c3.

I represents a horizontally-disposed guideplate for the pressure-belt, supported from the frame A of the machine and having its ends preferably beveled or rou nded,as shown, the lower face and said beveled or rounded portions being composed of. hardened steel. This guide-plate is engaged by the transverse bars h of the pressure-belt, and the hardened surface of the guide-plate will reduce wear and friction, as is clearly shown in Fig. l.

J represents a horizontal Work-supporting table, which is arranged in the machine so as to be capable of being raised and lowered. In the present instance I have shown the table Jsecured to the top of a vertically-movable carriage K, which is mounted in guides Zt, secured to the main frame of the machine, and the following-described devices are provided for elevating the said carriage and table:

L represents a crank shaft adjustably mounted in the lower ends of depending portions A of the main frame A and provided With a crank-arm Z, which is connected, by means of a link Z', with the vertically-movable carriage K in such a manneras to form a toggle-lever. (See Figs. l and 8.) The shaft L is also provided with an operating foot-lever L', carrying at its outer end a paw] Z2, adapted to engage a toothed rack ZL. It will be seen that by depressing the lever L' the toggle, composed of the crank-arm Zand link Z,.will elevate the carriage K and work-table J. I prefer to provide the work-table J with a transversely-movable Work-support J', upon Which is placed the plate or article to be ground or polished, which is secured thereto in any usual or desired way. I also provide means for adjusting the Work-support transversely of the machine, comprising in this instance a screw-shaft j, passing through a part of the tableJ engaging the work-sup port and provided at its outer end with an operating-handle j or equivalent device.

M represents a casing or hopper secured to the main frame of the machine, partially surrounding the drum or roller C and adapted to contain the abrading material, such as the articles heretofore enumerated. I prefer also to provide a trough or chute m, extend ing from the portion of the hopper beneath the drum C to a point adjacent to the Worktable J for the purpose of inclosiug the IOO grinding or polishing belt and preventing the abrading material from dropping off of the same before reaching the plate or article to be polished.

The operation of the device Will be as follows: rIhe operator Will secure the plate or article to be polished upon the work-support .I and adjust said support transversely so as to bring the plate or article properly7 beneath the grinding or polishing belt D. The operator will then depress the lever L and elev vate the table .I and the work carried thereby until the plate to be polished is forced into contact with the rapidly-moving polishing-belt D. The table J will be elevated to such a point that the desired pressure of the polishing-belt upon the plate to be polished Will be secured when the transverse plates h h2 of the pressure-belt are between the polishing-belt and the guide-plate I. As these transverse plates are located at intervals, it Will be observed that the frictional resistance to the forward movement of the two belts Will be much less than would be the case if the pressure Were exerted upon the pressure-belt over the entire area of the plate or article to be polished, While, by reason of the fact that the transverse plates or bars h2, which engage the polishing-belt, are disposed in difterent positions transversely of the pressurebelt and of the polishing-belt, the entire surface of the plate or article to be polished Will be treated. I am therefore enabled by my construction of apparatus to secure very uniform results and at the same time to drive my apparatus With a minimum amount of power.

What I claim, and desire to secure by Letters Patent, is-

l. In a grinding and polishing machine, the combination with supporting rollers, of a grinding and polishing belt comprising a series of separate belts placed edge to edge and an outer covering of polishing material permanently secured to and uniting said separate belts, and driving` mechanism, substantially as described.

2. In agrinding and polishing machine, the combination With an endless grinding and polishing belt, of a pressure-belt having portions contiguous to portions of the grinding and polishing belt and mechanism for driving the contiguous portions of the two belts at the same rate of speed, substantially as described.

3. In a grinding and polishing machine, the combination with an endless grinding and polishing belt, of a pressure-belt having portions contiguous to portions of the grindingand polishing belt, a rigid guide engaging the pressure-belt on the side opposite the grinding and polishing belt, means for driving the contiguous portions of the tWo belts in the same direction at the same rate of speed and a movable Work-support, substantially as described.

4. In a grinding and polishing machine, the combination with an endless grinding and polishing belt, of an endless pressure-belt having portions contiguous to portions of the grinding and polishing belt, trictional bearing devices secured to the pressure-belt on the side opposite that engagedby the grinding and polishing belt and a rigid bearingplate adapted to be engaged by said frictional bearing devices, substantially as described.

5. In a grinding and polishing machine, the combination with an endless grinding and polishing belt, of an endless pressure-belt having portions contiguous to portions of the grinding and polishing belt, transverse bearingbars secured to said pressure-belt at intervals and a stationary guide-plate adapted to be engaged by said bearing-bars, substantially as described.

6. In a grinding and polishing machine, the combination with an endless grinding and polishing belt, of an endless pressure-belt having portions contiguous to portions of the grinding and polishing belt, a series of pressurebars secured to said pressure-belt at intervals onthe side adjacent to the grinding and polishing belt, substantially as described.

'7. In a grinding and polishing machine, the combination with anendless grinding and polishing belt, of an endless pressure-belt having portions contiguous to portions of the grindingvand polishing belt, a series of pressurebars secu red to said pressure-belt at intervals on the side adjacent to the grinding and polishing belt, and a stationary guide engaging said pressure-belt on the side opposite said pressure-bars, substantially as described.

8. In a grinding and polishing machine, the combination With an endless grinding and polishing belt, of an endless pressure-belt having portions contiguous to portions of the grinding and polishing belt, a series of pressurebars secured to the said pressure-belt on the side adjacent to the grinding and vpolishing belt at intervals and disposed in dierent positions transversely of the belt and a stationary guide for engaging the pressure-belt on the side opposite said pressure-bars, substantially as described.

9. In a grinding and polishing machine, the

combination With an endless grinding and polishing belt, of an endless pressure-belt having portions contiguous to portions of the grinding and polishing belt, a series of pressurebars secured to said pressure-belt on the side adjacent to the grinding and polishing belt, a series of transverse bearing-bars secured to said pressure-belt on the opposite side thereof and in line With said pressure-bars, said pressure-bars being located in different, positions transversely of the belt, and a stationary guide adapted to be engaged by said bearing-bars, substantially as described.

10. In a grinding and polishing machine,the combination With an endless grinding and polishing belt, of an endless pressure-belt having portions contiguous to portions of the grinding and polishing belt, a series of pressurebars secured to said pressure-belt on the side IOO adjacent to the grinding and polishing beit, means for moving;` said Work-support toward ro a series of transverse bearing-bars secured to the polishing-belt, substantially as described.

said pressure-belt on the opposite side there- In testimony whereof I aix my signature of and in line with said pressure-bars, said in the presence of two Witnesses. pressurebars being located in different positions transversely of the belt, and a station- WILLIAM L' GODFREY aryguide adapted to be engaged by said bearl/Vitnesses:

ing-bars, a Work-support on the side of the FRED ELLIOTT,

polishing-belt opposite the pressure-belt and H. R. FERGUSON. 

